These are not anagolous to the hypothetical I gave. Identical twins aren't copies of the same adult mind at a particular instant. They've undergone years of different development, accumulated different memories etc and have physically different brains. Your worm and mice examples are the same. It's not identical even in the same lab.

The relevant hypotheical is: make 1200 exact copies of you right now, same brain, memories etc and then give related tasks towards one objective. I would expect far more correlated behaviour than if you randomly selected 1200 humans.